Bryn Mawr is a census-designated place located across Radnor and Haverford Townships in Delaware County, Pennsylvania and Lower Merion Township, Montgomery County, Pennsylvania, just west of Philadelphia along Lancaster Avenue and the border with Delaware County. Bryn Mawr is located toward the center of what is known as the Main Line, a group of affluent Philadelphia suburban villages stretching from the city limits to Malvern. As of the 2010 census, it had a population of 3,779. More from Wikipedia...